Roads Designed for Cycling

Road design should account for bicycle needs. A bicycle should be a design vehicle, which means planners should consider its operational needs during road design. Since roads are generally designed for wider and faster vehicles, most roads can also accommodate cycling. This basic principle forms the foundation for safe cycling infrastructure. Despite this, a few specific considerations can make a road much safer and more convenient for cyclists.

Special Considerations for Cyclists

Surface Quality: A smooth asphalt surface is crucial for a cyclist’s safety and comfort. Roads must be free of holes and bumps, as these can cause a cyclist to lose control. Regular maintenance is essential to prevent these hazards from developing over time.

Holes and Ridges: Slots parallel to the road, like some drain grates, can trap a bicycle wheel and cause serious falls. Ridges parallel to the roadway, such as railroad tracks and bridge joints, also pose a significant risk. Road crews must fix these defects to create a safer environment for cyclists.

Slippery Metal: Metal surfaces on roads, such as bridge decks or manhole covers, become extremely slippery when wet. Bridges with metal decks should have a concrete section to provide traction. When road work requires metal plates, these should be placed out of the way of a cyclist’s normal route. If that’s not possible, road crews should install clear warning signs to alert cyclists to the hazard.

Traffic Light Activators: Traffic detectors should be sensitive to bicycles. Planners should place these detectors where bicyclists wait for a light to change. If a detector is not sensitive enough, a cyclist may have to wait for a car to trigger the signal, causing unnecessary delays. Traffic signal timing should also provide cyclists enough time to safely clear an intersection, especially if they enter on a yellow light.

Lane Width: Lanes should be wide enough for cyclists and motorists to share safely side by side. A minimum width of 14 feet is needed for this. This space includes any smooth, paved shoulder. When on-street parking exists, the combined width of the parking and travel lanes should be 24 feet. This is the preferred width, with 22 feet being the minimum. On roads that are too narrow to share, a “Share the Road” reminder sign can encourage motorists to travel in the middle of the lane, signaling that cyclists may also do so for their safety.

Safe Intersection Design

Intersections: Intersections pose unique challenges for cyclists. Designers should ensure that sightlines are clear, allowing both cyclists and drivers to see each other. Special signal phases for cyclists can reduce conflicts, though they may increase wait times. Bike lanes should also be designed to guide cyclists safely through an intersection, especially when there are right-turn-only lanes.

Bicycle Laws

“Inferior legal status for cyclists turns cyclists into the lepers of the roads.”
– John Forester, Effective Cycling

This report guides readers in understanding bicycle laws. It helps to clarify the legal treatment of bicyclists in traffic. The analysis and recommendations can assist those interested in reforming state vehicle codes. It is also a resource for anyone who wants to learn how bicyclists are treated under traffic laws.

Laws related to bicycling from all 50 U.S. states were reviewed for this report. The official state websites provided most of the traffic codes. Local governments also have thousands of traffic ordinances. The rules in these local codes may not be consistent with state law. The information can also be used to reform local laws.

Why Traffic Law Matters

The highway codes in every U.S. state treat cyclists as drivers of vehicles. However, many states have added unnecessary and prejudicial rules that apply only to cyclists. Such rules create the false public idea that cyclists are not drivers. The law should not reflect the belief that cyclists have inferior rights. When traffic laws are fair, judges, police, and the public are more likely to treat cyclists as vehicle drivers.

There are several reasons why traffic laws for cyclists should be free of prejudice. First, statutes are often the basis for “safe bicycling” information given by police. Second, the wording affects law enforcement behavior. Third, statutes are a factor in determining negligence in civil proceedings after crashes. The law should not require more equipment or caution than is necessary for safe operation.

Statutes should also be clear and easy to interpret. It should be easy to understand the law without needing legal expertise.

Cyclists and the Traffic Law

There is no single national traffic law in the U.S. Each state has different laws. The Uniform Vehicle Code (UVC) is a model law for states to adopt. Most states have adopted a version of this code.

Vehicle codes regulate people, not vehicles. They regulate pedestrians and drivers. Drivers are people operating any wheeled vehicle on roadways. This includes both non-motorized and motor vehicles. All drivers must obey all laws for drivers. Drivers of motor vehicles must obey additional rules.

Cyclists riding on a roadway or shoulder are drivers of vehicles. They must follow all laws for drivers. Cyclists walking with their bicycles are considered pedestrians.

In every state, cyclists have the same duties and privileges as motorists. The general principles of traffic operation are designed to reduce collisions. They also allow for faster travel. Cyclists function well within this system.

Motor vehicle operators must meet additional requirements that cyclists do not. These include driver’s licenses, vehicle registration, and insurance. State laws should clarify that these special rules apply only to motor vehicles.

Almost all states define a cyclist as a driver of a vehicle. This is done by explicitly stating that cyclists have the rights and duties of drivers. A common version of this rule is overly restrictive. It mentions only “upon a roadway,” which does not include the shoulder. A clear law would state that a cyclist has all the rights and duties of any other vehicle driver.

Uniformity of Traffic Laws

State laws generally take precedence over local laws. Many states have specific provisions for this. Statewide uniformity is good for cyclists. It prevents local governments from passing rules that are unfriendly to cyclists.

The UVC permits local governments to regulate the “operation of bicycles.” This can be a license to enact local rules that apply only to bicycles. This can lead to unwarranted rules and the exclusion of bicycles from certain roads.

State laws also allow for local registration of bicycles. Mandatory registration rules have been used to harass cyclists in the past.

Defining “Bicycle”

Most states define the word bicycle in their traffic laws. The definition should exclude scooters and unicycles. It should not exclude small-wheeled or adult tricycles. Some current state laws are overly restrictive.

A recommended wording for the definition of “bicycle” is: “Every vehicle propelled solely by pedals, operated by one or more persons, and having two or more wheels, except children’s tricycles.”

Bicycle-Specific Rules in General Driving Laws

All general driving rules apply to bicycles. However, a few of these rules need to be updated to account for bicycles.

Right Turn Hand Signal: The right arm signal for a right turn is more intuitive for cyclists. Many states now permit this signal.

Continuous Signal: Many states require a continuous turn signal for a certain distance. This can be dangerous and difficult for a cyclist. Many states now exempt cyclists from this requirement.

Sidewalk Use: A person walking a bicycle is considered a pedestrian. Cyclists are generally safer on the roadway. However, some states permit sidewalk bicycling in certain situations. They may require cyclists to yield to pedestrians.

Manner of Making Left Turns: Cyclists and motorcyclists do not occupy an entire lane width. The rule for making a left turn should be clarified. The turn should be made from the left-most portion of the road. This is not just the left-most lane.

Following Too Closely: The standard language on tailgating should apply only to motor vehicles. If applied to bicycles, it could be interpreted as prohibiting riding in a group for drafting.

Parking on Sidewalks: Many states prohibit parking on sidewalks. In states where bicycles are vehicles, this applies to bicycles. States should permit bicycles to park on sidewalks, but with restrictions. The restrictions should ensure they do not block pedestrians.

Racing and Impeding Traffic: Some states have rules on racing that could apply to any group of cyclists. These rules should be modified to apply only to motor vehicles. Similarly, rules prohibiting impeding traffic should not apply to bicycles.

Slow-Moving Vehicle Rule: This rule requires slow-moving vehicles to keep to the right. This rule is sufficient. It is more effective than a separate “bicycles keep to the far right” rule.

Bicycle Equipment

Night Visibility from the Front: All states require a headlight after dark. The required visibility distance varies. A generator light should be permitted.

Night Visibility from the Rear: Most states require a rear reflector. Some states require a rear red light. All states specify a minimum visibility distance for reflectors.

Brakes: Every state has a rule about braking. Some require the brake to cause the rear wheel to skid. Others specify a stopping distance.

Helmets: Some states have laws requiring helmets for children. No U.S. state has a mandatory helmet law for all adult cyclists.

Discriminatory Rules

Most states have adopted discriminatory rules. These are rules of bicycle operation that do not apply to other vehicles. These rules are unnecessary and can be dangerous. They encourage cyclists to deviate from traffic rules. They also encourage others to treat cyclists differently.

Bicycles to the Far Right Rule: Most states require cyclists to keep to the far right. This rule is redundant and prejudicial.

Mandatory Bike Lane Use: Some states require cyclists to use a bike lane if one is present. Most of these rules have exceptions.

Mandatory Shoulder or Sidepath Use: A few states require cyclists to use the shoulder or a sidepath. Many states have repealed these rules because sidepaths are often more dangerous.

Number of Riders Abreast: Most states have a rule about riding abreast. Many permit riding two abreast unless traffic is impeded. Some require single-file riding.

Left Turn Prohibition: Some states allow signs to prohibit cyclists from making a normal left turn. This is discriminatory. It is impossible to predict when a vehicular turn is not safe.

Expressway Prohibition: All states prohibit cyclists on at least some express highways. This rule should be re-examined. It should be based on safety rather than a general ban.

Special Rules for Motorists

A few states have adopted special rules for how motorists should act around cyclists. Some of these are helpful. They include laws requiring a safe passing distance. They also include laws requiring motorists to use due care to avoid collisions.

Some states, such as Minnesota, have clarified how a motorist should turn right. They must merge into the bike lane before the turn. This helps reduce confusion.

Overall, a lack of bicycle-specific laws is a good thing. It means cyclists are treated the same as any other vehicle operator. Changes are needed to remove discriminatory rules and clarify general traffic laws.

Bikeways

Many people believe that the construction of special bicycle facilities is necessary to increase bicycle safety and to encourage more cycling. However, bikeways can make bicycle transportation more dangerous and less convenient insofar as they discourage bicyclists and motorists from following the rules of the road for drivers of vehicles.

There are three types of bikeways:

sidepath: a path adjacent to the roadway but separated from it by a physical barrier.

bike path: a path that is not adjacent to a roadway, but is in its own right-of-way, such as a former railway line.

bike lane: a traffic lane on a roadway marked for bicycle use only, and separated from the rest of the roadway only by markings.

Bicycle Sidepaths

A sidepath is a designated path for bicycles that runs next to a roadway. In some places, laws may require bicyclists to use this sidepath instead of the road. Sidepaths are essentially a marked section of the sidewalk. They can pose hazards for both pedestrians and cyclists. For instance, pedestrians with strollers may cross the path. On-street parking can also block the path.

At intersections, sidepaths present the same dangers as riding on a sidewalk. When a sidepath is designed for two-way traffic, half of the riders are traveling against the flow of traffic. This puts them at an especially high risk. A possible solution is to use special traffic signal phases for cyclists. However, this often requires cyclists to wait longer. This can lead to a greater chance of cyclists ignoring the signals.

Laws and Safety Studies

In the past, some cities designated sidewalks as bikeways. Today, these signs have largely been removed due to efforts by cyclists. Many mandatory sidepath laws have also been repealed. Despite this, some states still have such laws in place.

Numerous studies show that cyclists on sidepaths or sidewalks are at a higher risk of accidents. This risk is several times greater than for cyclists using the main roadway.

Bicycle Paths

Bike paths are not adjacent to a roadway. They often follow old railway lines, rivers, or run through parks. These paths can be useful for transportation, especially when they provide a shortcut around a barrier with no road alternative. However, they should always be seen as a supplement to, not a replacement for, using the roadway system. Bike paths can contribute to the public perception that cyclists should only use special facilities and not the main roads.

Risks and Safety Issues

The risk of injury for cyclists is actually higher on paths than on roads. This is due to several factors:

  • Mixing of Users: Paths are used by bicyclists, pedestrians, children, skaters, dogs, and sometimes horses. This mix of users creates a hazard, as pedestrians can stop or turn instantly. Most bicyclists do not reduce their speed to a walking pace, which is often necessary to safely navigate this environment.
  • Poor Construction and Maintenance: Paths may not be maintained as well as roads and can have surface hazards. Designers sometimes include features like railings or bollards to deter motor traffic. These can also be a collision risk for cyclists.
  • Difficult Intersections: Crossing a road from a path can be difficult. The sightlines may be poor, and cyclists are almost always required to stop. They often face a stop or yield sign. However, the path crossing may be marked with a crosswalk, which can be confusing. A crosswalk indicates a right-of-way for pedestrians, but this may not apply to cyclists.

Bicycle Lanes

Special lanes for bicyclists can cause issues by encouraging both cyclists and motorists to disregard traffic rules. A bike lane that extends to an intersection can be confusing. Motorists turning right may stay in the left lane. This violates the rule that right turns should be made from the lane closest to the curb. Similarly, bicyclists going straight or turning left may be encouraged to stay on the right.

In some cases, bike lanes may even require bicyclists to break normal traffic rules. For example, a bike lane intended for straight-through travel may be on the left side of a left-turn-only lane. This can be unsafe.

Minimizing Confusion

Bike lanes cause fewer problems on roads with no on-street parking or intersections. In these cases, the lane is essentially a shoulder. Operational problems can be lessened by ensuring that bike lanes:

  • Serve only one direction of traffic.
  • They are located next to general traffic lanes with no barrier.
  • They are not next to on-street parking unless there is enough space to avoid doors.
  • They are removed before an intersection to allow for merging.
  • They are not used in roundabouts.

Calling a shoulder a “bike lane” can also confuse. This may create the perception that the shoulder is the only place for a bicycle. This can be mitigated by removing any legal obligation to use the lane. It can also be done by informing the public that cyclists are not required to use the lanes.

Mandatory Use and Safety Studies

In many countries, as well as several U.S. states, bicycle lane use is mandatory. However, some of these laws have exceptions. The specific legal definition of a “roadway” can be important. In some places, a bike lane is part of the roadway, which can increase restrictions on cyclists.

Studies have shown that motorists give cyclists slightly less space when passing them in a bike lane. Cyclists also tend to ride in the middle of a bike lane next to parked cars, which puts them at risk of being hit by opening doors. No studies have definitively shown that bike lanes improve safety.