Transportation Research Thesaurus (TRT)

  1. Shrinkage limit
  2. Shrouded propellers
  3. Shrubs
  4. Shuttle buses
  5. Shuttle service
  6. SI units USE Metric system
  7. Side air bags
  8. Side collisions
  9. Side impact collisions USE Side collisions
  10. Side lighting
  11. Side looking radar
  12. Side windows
  13. Sideswiping accidents USE Side collisions
  14. Sidewalks
  15. Sideways collisions USE Side collisions
  16. Siding
  17. Sidings (Railroads)
  18. Sieve analysis
  19. Sieves
  20. Sieving USE Sieve analysis
  21. Sight distance
  22. Sign sheeting
  23. Sign supports
  24. Signal control USE Signalization
  25. Signal devices
  26. Signal equipment USE Signal devices
  27. Signal face
  28. Signal generators
  29. Signal head
  30. Signal lamps USE Signal face
  31. Signal lights
  32. Signal processing
  33. Signal to noise ratio
  34. Signaling
  35. Signalisation USE Signalization
  36. Signalised intersections USE Signalized intersections
  37. Signalization
  38. Signalized intersections
  39. Signalling USE Signaling
  40. Signals
  41. Significance (Statistics)
  42. Signing USE Signs
  43. Signs
  44. Silane
  45. Silica
  46. Silica fume
  47. Silica gel
  48. Silica sands
  49. Silica stone
  50. Silicates
  51. Silicon
  52. Silicon alloys
  53. Silicon carbide
  54. Silicon compounds
  55. Silicon dioxide
  56. Silicon inorganic compounds
  57. Silicon nitride
  58. Silicones
  59. Silos
  60. Siltation USE Silting
  61. Silting
  62. Silting up USE Silting
  63. Silts
  64. Siltstones
  65. Silty clays
  66. Silty loams
  67. Silty sands
  68. Silver
  69. Simplex method
  70. Simulated annealing
  71. Simulation
  72. Simultaneous engineering USE Concurrent engineering
  73. Simultaneous equations
  74. Sine curves
  75. Single family dwellings
  76. Single lane traffic
  77. Single occupant vehicles
  78. Single point moorings
  79. Single point urban interchanges
  80. Single track
  81. Single vehicle accidents
  82. Sinkholes
  83. Sinking (Oceanography)
  84. Sintering
  85. Sinusoids USE Sine curves
  86. Sirens
  87. Site distance USE Visibility distance
  88. Site remediation USE Soil remediation
  89. Site selection USE Location
  90. Site surveys USE Surveying
  91. Size
  92. Size and weight regulations
  93. Sizing apparatus
  94. Skating
  95. Skegs
  96. Skeletal system
  97. Sketch planning
  98. Skew bridges
  99. Skewed distributions
  100. Skewed structures
  101. Skid resistance
  102. Skid resistance tests
  103. Skid trailers
  104. Skidding
  105. Skidding
  106. Skidmarks
  107. Skids
  108. Skin
  109. Skin and hair system
  110. Skin friction
  111. Skin injuries
  112. Skin resistance
  113. Skull
  114. Skull fractures
  115. Sky marshalls USE Sky marshals
  116. Sky marshals
  117. Skyjacking
  118. Slab on grade
  119. Slabs
  120. Slag
  121. Slag cement
  122. Slag coarse aggregates
  123. Slaking
  124. Slamming
  125. Slamming
  126. Slate
  127. Slave locomotives
  128. Sled tests
  129. Sleep
  130. Sleep deprivation
  131. Sleep disorders
  132. Sleepers USE Railroad ties
  133. Sleeping cars
  134. Sleeves (Electricity)
  135. Sliding forms
  136. Sliding friction
  137. Sliding mode control
  138. Slings
  139. Slip (Fluid mechanics)
  140. Slip bases USE Breakaway supports
  141. Slip form pavers
  142. Slip form paving
  143. Slip resistance
  144. Slip roads USE Approach roads
  145. Slip surfaces
  146. Slippage (Leakage)
  147. Slippage loss USE Slippage (Leakage)
  148. Slipperiness
  149. Slipping and falling accidents USE Falls
  150. Slope failure
  151. Slope stability
  152. Slopes
  153. Sloshing
  154. Slot allocation
  155. Slow moving vehicles
  156. Sludge (Deposit)
  157. Slugging (Ridesharing) USE Casual carpooling
  158. Sluices
  159. Slump test
  160. Slurry
  161. Slurry pipelines
  162. Slurry seals
  163. Slurry seals
  164. Slurry trenches
  165. Slush
  166. Small aircraft
  167. Small buses
  168. Small business
  169. Small cars USE Compact automobiles
  170. Small cities
  171. Small craft harbors USE Marinas
  172. Small shipments
  173. Small ships
  174. Small towns
  175. Smart cards
  176. Smart cars USE Intelligent vehicles
  177. Smart growth
  178. Smart highways USE Automated highways
  179. Smart materials
  180. Smart pigs
  181. Smart roads USE Automated highways
  182. Smart structures
  183. Smell USE Olfactory perception
  184. Smelting
  185. Smog
  186. Smog control USE Air quality management
  187. Smoke
  188. Smoke detectors USE Fire detection systems
  189. Smoking
  190. Smoothness
  191. SMS (Short message service) USE Text messaging
  192. Smuggling
  193. Smuggling
  194. Snow
  195. Snow
  196. Snow and ice control
  197. Snow clearance USE Snow removal
  198. Snow cover
  199. Snow fences
  200. Snow mechanics